21002201210 has 16 divisors (see below), whose sum is σ = 38726010792. Its totient is φ = 8195980800.

The previous prime is 21002201179. The next prime is 21002201249. The reversal of 21002201210 is 1210220012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7802718889 + 13199482321 = 88333^2 + 114889^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21002201191 and 21002201200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25612031 + ... + 25612850.

Almost surely, 2^21002201210 is an apocalyptic number.

21002201210 is a deficient number, since it is larger than the sum of its proper divisors (17723809582).

21002201210 is a wasteful number, since it uses less digits than its factorization.

21002201210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51224929.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21002201210 its reverse (1210220012), we get a palindrome (22212421222).

The spelling of 21002201210 in words is "twenty-one billion, two million, two hundred one thousand, two hundred ten".